I have searched already and and I can't find an answer to my question.

My truck: 2003 F250, 7.3 auto, crew cab short box, Tuff country level kit in front, One 4 inch tall block in the rear and a set of BDS add a leafs in the rear. 315/75-16 Kelly safari tsr

My problem: I get vibration/shudder from the rear when accelerating from a stop until 15mph. no matter how fast or slow I accelerate. there is NO shudder when stopping or when accelerating at any speed other then from a stop. also it did not happen right after I lifted the truck.

What I have done: the carrier bearing is shimmed down 1-1/4 inches and the two pieces of the drive shaft are .8 degrees different from each other. The u joints are less then a year old along with the trans from jasper. I just greased the slip joints and changed the rear diff fluid and added a container of friction modifier. The trans is full and the fluid is bright red and smells like brand new.

Questions: Torque converter shudder or axle wrap? How can I tell the difference?

I had the same thing happen to my truck until I replaced the rear u-joint..also got better mpg! I can still feel some vibration at low rolling(0-10mph) speeds but that's from my tires.. If you have axle wrap you would feel the back of the truck lift up a lil when ya pin it.

so after a tip from someone on another forum I zip tied a webcam underneath my truck so I could see what the rear diff was doing when I was driving. differently axle wrap, the drive shaft flange on the rear diff gets at least 2 inches closer to the bed when I go from dead stop at about half throttle. you can watch the diff return to it normal position at the same rate at the shudder decreases. I am buying a set of bolt on One Up Off Road traction bars and thank you everyone for the help.

so after a tip from someone on another forum I zip tied a webcam underneath my truck so I could see what the rear diff was doing when I was driving. differently axle wrap, the drive shaft flange on the rear diff gets at least 2 inches closer to the bed when I go from dead stop at about half throttle. you can watch the diff return to it normal position at the same rate at the shudder decreases. I am buying a set of bolt on One Up Off Road traction bars and thank you everyone for the help.

Sorry to butt in here.... I'm having the exact same issue as you're mentioning. When you say that your buy a set of bolt on one up off road traction bars...... how do you envision they will / can help you with this issue? I want to get my issue resolved too and suspect I'm suffering with the same thing.

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